Ed-Fi-ODS-Docker

This repository hosts the Docker deployment source code for ODS/API. To work with what is offered in this repository, set up your Docker environment by referring to the Docker Deployment document.

Exposed Ports

The compose files expose the databases outside of the Docker network (through PgBouncer). To disable this, modify the compose file by removing the ports key for the databases PgBouncers. For example:

pb-ods:
  image: pgbouncer/pgbouncer
  environment:
    DATABASES: "* = host = db-ods port=5432 user=${POSTGRES_USER} password=${POSTGRES_PASSWORD}"
    PGBOUNCER_LISTEN_PORT: "${PGBOUNCER_LISTEN_PORT:-6432}"
  ports:
    - "5402:${PGBOUNCER_LISTEN_PORT:-6432}"
  restart: always
  container_name: ed-fi-pb-ods
  depends_on:
    - db-ods

would be changed to:

pb-ods:
  image: pgbouncer/pgbouncer
  environment:
    DATABASES: "* = host = db-ods port=5432 user=${POSTGRES_USER} password=${POSTGRES_PASSWORD}"
    PGBOUNCER_LISTEN_PORT: "${PGBOUNCER_LISTEN_PORT:-6432}"
  restart: always
  container_name: ed-fi-pb-ods
  depends_on:
    - db-ods

Supported environment variables

.env.example file included in the repository lists the supported environment variables.

PGBouncer logging

By default, PgBouncer logs the configuration file which contains sensitive information such as the host database username and password.
This functionality can be disabled by applying the QUIET flag. The latest version of .env.example has the configuration variable PGBOUNCER_QUIET="true" which will suppress this messaging. However, older .env files that do not supply the PGBOUNCER_QUIET configuration variable are still at risk of exposing this sensitive information in logs.

Connection Pooling Options

These compose files use PGBouncer to provide a server-side connection pooling solution for PostgreSQL. Without such connection management the database server will likely run out of connections and require a restart. While there are alternatives to PGBouncer for server-side connection pooling, another approach is to use the client-side connection pooling provided by the npgsql ADO.NET Data Provider. However, before using client-side pooling, there are some important considerations.

Client-side pooling with npgsql is based on the connection string (see Npgsql Connection Pool Explained). The pool can be configured in the connection string with a minimum (default=0) and maximum (default=100) pool size. When a connection is requested from the client-side pool the first time, the pool will be initialized with the configured minimum number of connections (default=0). After that, the pool will continue to increase in size (as needed) up to the configured maximum (default=100). Additionally, the pool will release an idle connection after a period of inactivity (default=300s).

One of the challenges with client-side pooling is that by default there is a connection limit of 100 in PostgreSQL, so when configuring client-side pooling the nature of the deployment environment will greatly influence what an appropriate configuration would be (to avoid connection failures by exceeding the total number of available connections). Consider the following:

• The Admin App and API processes/containers would each have a minimum of 3 connection pools (for the EdFi_Admin, EdFi_Security and the EdFi_Ods databases).
• In a year-specific deployment, the number of distinct ODS connection strings (and pools) grows for each school year.
• In a district-specific or instance-based deployment the number of pools could get to be quite large.
• Factor in additional containers for high availability and/or scale out, and the total number of client connection pools increases further.

As a result, client-side pooling may be untenable for all but the simplest of deployments.

The following environment variables can be used to control client-side pooling with the API, Admin App and Sandbox Admin containers:

Name	Applies To	Description
NPG_POOLING_ENABLED	All	Enables or disables client-side pooling (default: false).
NPG_API_MAX_POOL_SIZE_ODS	API	The maximum number of connections for each distinct ODS database from each Ed-Fi ODS API container.
NPG_API_MAX_POOL_SIZE_ADMIN	API	The maximum number of connections for the EdFi_Admin database from each Ed-Fi ODS API container.
NPG_API_MAX_POOL_SIZE_SECURITY	API	The maximum number of connections for the EdFi_Security database from each Ed-Fi ODS API container.
NPG_API_MAX_POOL_SIZE_MASTER	API	The maximum number of connections for the 'postgres' default database from each Ed-Fi ODS API container.
NPG_ADMIN_MAX_POOL_SIZE_ODS	Admin App	The maximum number of connections for each distinct ODS database from each Admin App container.
NPG_ADMIN_MAX_POOL_SIZE_ADMIN	Admin App	The maximum number of connections for the EdFi_Admin database from each Admin App container.
NPG_ADMIN_MAX_POOL_SIZE_SECURITY	Admin App	The maximum number of connections for the EdFi_Security database from each Admin App container.
NPG_SANDBOX_MAX_POOL_SIZE_ODS	Sandbox Admin	The maximum number of connections for each distinct ODS database from each Ed-Fi Sandbox Admin container.
NPG_SANDBOX_MAX_POOL_SIZE_ADMIN	Sandbox Admin	The maximum number of connections for the EdFi_Admin database from each Ed-Fi Sandbox Admin container.
NPG_SANDBOX_MAX_POOL_SIZE_SECURITY	Sandbox Admin	The maximum number of connections for the EdFi_Security database from each Ed-Fi Sandbox Admin container.
NPG_SANDBOX_MAX_POOL_SIZE_MASTER	Sandbox Admin	The maximum number of connections for the 'postgres' default database from each Ed-Fi Sandbox Admin container.

To remove PGBouncer, make the following changes:

1. Remove and/or comment out the pb-admin and pb-ods* services from the compose file.
2. Update admin, and api services and change the database environment variables (ODS_POSTGRES_HOST, and ADMIN_POSTGRES_HOST) to point to db-ods and db-admin from pb-ods and pb-admin.
3. Update the POSTGRES_PORT environment variable to point to 5432.
4. If required expose the port on the services db-admin, and db-ods services. Note these ports should be independent.

Contributing

The Ed-Fi Alliance welcomes code contributions from the community. For more information, see:

• Ed-Fi Contribution Guidelines.
• How to Submit an Issue.
• How Submit a Feature Request.

Legal Information

Copyright (c) 2020 Ed-Fi Alliance, LLC and contributors.

Licensed under the Apache License, Version 2.0 (the "License").

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

See NOTICES for additional copyright and license notifications.